Need Help Buying Workout Clothes

After putting up with several waves of chronic fatigue, I finally tried creatine ethyl ester and got my energy back. Now I'm ready to hit the gym and start building back what sedentary living and spasticity have torn down, but I've always been such a "t-shirt and jeans" kind of guy that I need some help on the clothing front.

For one thing, it would really help me if any of you can point me to cheap places to buy gear. Long story short: at a time when I should be saving everything I can, I can't get around the fact that I need new clothes.

The other thing I need help with is clothing types. Case in point: I bought a couple of cheapo rash guards years ago, but they're so tight on me that I look like I should be dancing to house music in San Francisco. Are there moisture wicking shirts that fit more like a t-shirt? I generally run hot and I become a damn fireball during exertion, so I need all the help I can get to stay cool while being reasonably dressed.

That is about all I can think to say for now. I have never thought much about exercise as a specific activity (as opposed to getting exercise by moving lumber or harvesting vegetables), and I'm pretty sure I'll die if I do another heavy workout while wearing jeans.

I'm a big fan of basketball shorts and generic t-shirts for exercising. They aren't fancy, and, as I generally buy them at Ross, aren't very expensive, but the basketball shorts are damn comfortable and the t-shirts do a decent job of getting the sweat away, though it seems that thicker t-shirts(like these badass Puritan ones I got at walmart for nine dollars) actually do better at removing the sweat that thinner ones.

The C9 by Champion gear rocks. I do most of my FMA training in them and they have held up well with striking, weapons and the limited grappling that I've done. Its not expensive stuff but its difficult to rip or stretch out of shape.